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REDOX REACTION

Q1. What is disproportionation reaction? Give an example.

Q2. Assign oxidation number to the underlined elements in the
following.

(i)NaBH4, (ii)H2S4O6, (iii)H2SO5, (iv)CrO5, (v)H4P2O7, (vi)H2S2O7,

(vii)H 2S 2O 8, (viii)CaO 2, (ix)LiAlH 4, (x)CH 3COOH, (xi)CH 3CH 2OH

2-
(xii)KAl (SO4)2.12H2O, (xiii)NaH2PO4, (xiv)KI3, (xv)Cr2O7

Q3. Is the following reaction a redox reaction?

+
Cr2O7 + H2O → 2CrO 4 + 2H
2-
2-
Q4. F2 reacts with ice and results in the following change:

H2O(s) + F2 → HF + HOF

Justify that this reaction is a redox reaction.

Q5. Justify that the following reaction is a redox reaction.

2Cu2O + Cu2S → 6Cu + SO 2

Q6. Identify the substances oxidised, reduced, oxidising agent and

reducing agent for the following reaction.

Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Q7. Balance the following equation by ion-electron method in acidic
medium.

- 2- 2+
(i)MnO4 + C2O4 → Mn + CO2

2- 2+ 3+ +
(ii) Cr2O7 + Sn → Cr + Sn4